Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Two Thousand Twenty One Dividend Reinvestment and Stock Purchase Plan [Member] Common Stock [Member]	Two Thousand Twenty One Dividend Reinvestment and Stock Purchase Plan [Member] Common Stock Including Additional Paid in Capital [Member]	Two Thousand Twenty One Dividend Reinvestment and Stock Purchase Plan [Member] Retained Earnings [Member]	Two Thousand Twenty One Dividend Reinvestment and Stock Purchase Plan [Member]	Two Thousand Twenty Four Dividend Reinvestment and Stock Purchase Plan [Member] Common Stock [Member]	Two Thousand Twenty Four Dividend Reinvestment and Stock Purchase Plan [Member] Common Stock Including Additional Paid in Capital [Member]	Two Thousand Twenty Four Dividend Reinvestment and Stock Purchase Plan [Member] Retained Earnings [Member]	Two Thousand Twenty Four Dividend Reinvestment and Stock Purchase Plan [Member]	Common Stock [Member]	Common Stock Including Additional Paid in Capital [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Sep. 30, 2023									7,671,099
Balance at Sep. 30, 2023										$ 21,800	$ 65,952	$ 87,752
Net income										0	7,097	7,097
Dividends paid										0	(4,222)	(4,222)
Employee and director restricted stock vested (in shares)									133,744
Employee and director restricted stock vested										0	0	0
Repurchase of vested employee restricted stock for tax withholding (in shares)									(39,410)
Repurchase of vested employee restricted stock for tax withholding										(295)	(108)	(403)
Shares issued for auto-investments pursuant to the 2021 Dividend Reinvestment and Stock Purchase Plan (in shares)	1,245				2,243
Shares issued for auto-investments pursuant to the 2021 Dividend Reinvestment and Stock Purchase Plan		$ 8	$ 0	$ 8		$ 19	$ 0	$ 19
Shares issued for dividend reinvestment pursuant to the 2021 Dividend Reinvestment and Stock Purchase Plan (in shares)	2,625				6,789
Shares issued for dividend reinvestment pursuant to the 2021 Dividend Reinvestment and Stock Purchase Plan		$ 17	$ 0	$ 17		53	0	53
Stock-based compensation										990	0	990
Balance (in shares) at Sep. 30, 2024									7,778,335
Balance at Sep. 30, 2024										22,592	68,719	91,311
Net income										0	9,960	9,960
Dividends paid										0	(4,281)	(4,281)
Employee and director restricted stock vested (in shares)									145,509
Employee and director restricted stock vested										0	0	0
Repurchase of vested employee restricted stock for tax withholding (in shares)									(41,443)
Repurchase of vested employee restricted stock for tax withholding										(319)	(140)	(459)
Shares issued for auto-investments pursuant to the 2021 Dividend Reinvestment and Stock Purchase Plan (in shares)					676
Shares issued for auto-investments pursuant to the 2021 Dividend Reinvestment and Stock Purchase Plan						7	0	7
Shares issued for dividend reinvestment pursuant to the 2021 Dividend Reinvestment and Stock Purchase Plan (in shares)					6,864
Shares issued for dividend reinvestment pursuant to the 2021 Dividend Reinvestment and Stock Purchase Plan						$ 77	$ 0	$ 77
Stock-based compensation										1,128	0	1,128
Employee restricted stock forfeiture (in shares)									0
Employee restricted stock forfeiture										(7)	0	(7)
Balance (in shares) at Sep. 30, 2025									7,889,941
Balance at Sep. 30, 2025										$ 23,478	$ 74,258	$ 97,736